"Sharp"
Sharp among most scholars and a good number of singers, were fully aware that the mortifs of the songs reached as far back as Homer
The Arab countries, Italy, Britain, Europe as a whole.... shared motifs that related them all as Indo-European
Nothing special about The Decameron, as many of the internationally shared tales showed
'The Pear Tree', discovered by Ian Russell in the 70s is directed related to a Chaucer tale
"polygenetic"
We may never know how many were related, (jus as we'll never know who made our folk songs) but we know of hundreds of example for certain
Jim, Carroll